Selected Answer:
Compute R2.
Answers:
Calculate a weighted sample size called a harmonic mean.
Calculate HSD for each pair of means.
Compare the means of all groups using Bonferroni first.
Compute R2.
Question 10
5 out of 5 points
Which is the correct formula for calculating the subjects sum of squares for a within-
groups ANOVA?
Selected Answer:
å(Mparticipant – GM)2
Answers:
å(Mparticipant – GM)2
å(Mparticipant – X)2
å(M)(n – 1)
å(Mparticipant – GM)
Question 11
5 out of 5 points
Pet preference was compared for four different types of animals (dogs, cats, birds,
and fish), using a one-way within-groups ANOVA with seven participants. The
standard error was calculated as 0.21. Where are the significant effects for
preference among these groups, given the following means for preference: Dogs M =
4.43, Cats M = 4.18, Birds M = 2.73, Fish M = 4.07?
Selected Answer:
Preference for birds is significantly lower than for the other three groups, and there
are no other differences among the mean preferences.
Answers:
Preference for birds is significantly lower than for the other three groups, and there
are no other differences among the mean preferences.
Dogs and cats are preferred over birds and fish, but there are no differences between
the other groups.
Birds and fish are less preferred than dogs and cats, but there are no other
differences present.

All post hoc tests were significant at the 0.05 level.
Question 12
5 out of 5 points
A measure of variability that is essentially an average of the sample variances is the:
Selected Answer:
within-groups variance.
Answers:
z score.
between-groups variance.
within-groups variance.
proportionate reduction in error.
Question 13
0 out of 5 points
According to Cohen's conventions, an effect size of 0.29 for a one-way within-groups
ANOVA is considered to be:
Selected Answer:
small.
Answers:
small.
medium.
medium to large.
large.
Question 14
5 out of 5 points
The z, t, and F distributions have something in common—the denominator of the
test statistic:
Selected Answer:
contains a measure of variability within the various groups.
Answers:
contains a measure of difference among group means.
contains a measure of variability within the various groups.
is a squared number.
represents what would be expected if the null hypothesis were true.
Question 15
5 out of 5 points
The Bonferroni, Scheffé, and Tukey are all examples of:
Selected Answer:
post hoc tests.
Answers:
hypothesis tests.
post hoc tests.
effect size statistics.
a priori tests.
Question 16
5 out of 5 points
Changes in between-groups variance result in changes in the _____ of the F ratio.

Selected Answer:
numerator
Answers:
denominator
numerator
sign
direction
Question 17
5 out of 5 points
Dr. Sanders was interested in investigating the effects of stress on memory. He
exposed participants to public-speaking stress and room-temperature stress and
gave them a memory measure immediately after exposure to the two stressors. Dr.